* should be used specifically for [java.io.Closeable] objects and in conjunction with
   * [logCloseableLeak].
   */
  open fun getStackTraceForCloseable(closer: String): Any? {
    return when {
      logger.isLoggable(Level.FINE) -> Throwable(closer) // These are expensive to allocate.
      else -> null
    }
  }

  open fun logCloseableLeak(
    message: String,
    stackTrace: Any?,
  ) {

  @Volatile
  private var addressStates: Map<Address, AddressState> = mapOf()

  private val cleanupQueue: TaskQueue = taskRunner.newQueue()
  private val cleanupTask =
    object : Task("$okHttpName ConnectionPool connection closer") {
      override fun runOnce(): Long = closeConnections(System.nanoTime())
    }

  private fun AddressState.scheduleOpener() {
    queue.schedule(
      object : Task("$okHttpName ConnectionPool connection opener") {

25A0..25EF    ; valid                  ;      ; NV8    # 1.1  BLACK SQUARE..LARGE CIRCLE
25F0..25F7    ; valid                  ;      ; NV8    # 3.0  WHITE SQUARE WITH UPPER LEFT QUADRANT..WHITE CIRCLE WITH UPPER RIGHT QUADRANT
25F8..25FF    ; valid                  ;      ; NV8    # 3.2  UPPER LEFT TRIANGLE..LOWER RIGHT TRIANGLE

Certificate Authorities
-----------------------

The above example uses a self-signed certificate. This is convenient for testing but not
representative of real-world HTTPS deployment. To get closer to that we can use `HeldCertificate`
to generate a trusted root certificate, an intermediate certificate, and a server certificate.
We use `certificateAuthority(int)` to create certificates that can sign other certificates. The

      other entities that control, are controlled by, or are under common
      control with that entity. For the purposes of this definition,
      "control" means (i) the power, direct or indirect, to cause the
      direction or management of such entity, whether by contract or
      otherwise, or (ii) ownership of fifty percent (50%) or more of the

flickr

// flights : 2013-12-05 Binky Moon, LLC
flights

// flir : 2015-07-23 FLIR Systems, Inc.
flir

// florist : 2013-11-07 Binky Moon, LLC
florist

// flowers : 2014-10-09 XYZ.COM LLC
flowers

// fly : 2014-05-08 Charleston Road Registry Inc.
fly

// foo : 2014-01-23 Charleston Road Registry Inc.
foo

// food : 2016-04-21 Lifestyle Domain Holdings, Inc.
food

fjaler.no fjell.no fl.us fla.no flakstad.no flanders.museum flap.id flatanger.no fldrv.com flekkefjord.no flesberg.no flickr flier.jp flight.aero flights flir flog.br floppy.jp flora.no florence.it florida.museum floripa.br florist floro.no florø.no flowers flt.cloud.muni.cz fly fly.dev flynnhosting.net flå.no fm fm.br fm.it fm.no fnc.fr-par.scw.cloud fnd.br fnwk.site fo foggia.it folionetwork.site folkebibl.no folldal.no foo food foodnetwork fool.jp football for-better.biz for-more.biz for-our.info...

      verifyHostname(hostname, it)
    }
  }

  /**
   * This is like [toLowerCase] except that it does nothing if this contains any non-ASCII
   * characters. We want to avoid lower casing special chars like U+212A (Kelvin symbol) because
   * they can return ASCII characters that match real hostnames.
   */
  private fun String.asciiToLowercase(): String {
    return when {

    }
  }

  /** Builds a configured certificate pinner. */
  class Builder {
    val pins = mutableListOf<Pin>()

    /**
     * Pins certificates for `pattern`.
     *
     * @param pattern lower-case host name or wildcard pattern such as `*.example.com`.
     * @param pins SHA-256 or SHA-1 hashes. Each pin is a hash of a certificate's Subject Public Key

server: the port number, HTTPS settings, and preferred network protocols (like HTTP/2).

URLs that share the same address may also share the same underlying TCP socket connection. Sharing a connection has substantial performance benefits: lower latency, higher throughput (due to [TCP slow start](https://www.igvita.com/2011/10/20/faster-web-vs-tcp-slow-start/)) and conserved battery. OkHttp uses a [ConnectionPool](https://square.github.io/okhttp/4.x/okhttp/okhttp3/-connection-pool/) that automatically...